1. LCLS Commissioning Parameters
Value
Comments
RF rate
30 Hz
30 Hz in linac Hz in gun hot test
Beam rate
≤30 Hz
10 Hz e- beam as baseline – possible short term 30-Hz tests (difficult beyond 30 Hz due to laser rate)
Drive-laser rate
120-Hz during laser commissioning – 30 Hz during e- commissioning - shutters provide lower e- rate
Bunch charge pC
depends on QE and diagnostics – some short spans at 10 pC – later in ’07 explore 1-nC
Drive-laser pulse length
6 ps fwhm
6-ps fwhm startup at low charge with possibility of 10-ps at 1 nC
Gun gradient
120 MV/m
Baseline level, although MV/m is adequate in ‘07
Nov. 4, 2006